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       Check whether the sealing ring of the furnace door is damaged. If there is dirt on the sealing ring, Juli transformer should be cleaned in time. It is best to wipe it with cotton cloth dipped in alcohol and apply vacuum grease.

　　Check whether the hearth and molybdenum screen of the heating element in the furnace are intact, and the damaged parts should be repaired and replaced in time. When the furnace is contaminated, use a vacuum cleaner to remove the dust Ningbo Dust Collector, and wipe the heating chamber reflection screen and heating element with silk cloth dipped in alcohol; if there is oil stain on the inner wall of the furnace, first use cotton cloth dipped in gasoline to remove the oil stain, then use cotton cloth dipped in alcohol wipe. The furnace should be pumped to a certain degree of vacuum and stored at the end of each work.

       Check the oil level of the mechanical pump. When the oil level is lower than the mark line, add new oil to the oil mark; when the mechanical pump oil has emulsified #oil-water mixture, which is thick and white, please replace the old oil in time. The method is to unscrew the pressure cap of the oil drain hole of the mechanical pump, release the old oil, add a little new oil from the oil filling hole, rinse the pump cavity times, and then tighten the pressure cap of the oil drain hole of the mechanical pump, and add new oil from the oil filling hole to the mark Should not be too much, tighten the pressure cap of the refueling hole of the mechanical pump

　　During this process, it is necessary to prevent the sealing ring of the oil drain hole from being damaged. After each shift, wipe the surface of the furnace with a cotton cloth to remove dust and oil from the mechanical pump and diffusion pump.